"Mendelssohn Unknown" offers an intimate exploration of Felix Mendelssohn’s life and genius, using his letters and those of his sister Fanny. Evocative Super8 imagery brings his world to life. The documentary covers his training, religious and cultural identity, journey to Italy, Bach’s rediscovery, his Leipzig years, and the revival of his music after his death. Featuring insights from music experts, the film celebrates Mendelssohn’s profound legacy and the timeless beauty of his music.